Figure 1.
Phylogenetic tree of SHR-like proteins. Maximum-likelihood inference was determined for phylogenetic relationships between SHR proteins in a basal angiosperm, six monocot, and five eudicot species, rooted with sequence from the bryophyte P. patens. Five distinct SCL clades are resolved. Branch lengths measured in number of amino acid substitutions per site are indicated in black, and bootstrap values for each node are shown in red. Homeologous relationships in monocot SHR proteins are indicated with h. Arabidopsis (AtSHR), rice (OsSHR1 and OsSHR2), and maize (ZmSHR1, ZmSHR2, and homeolog ZmSHR2h) proteins are highlighted in boldface.